| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Accelerated Qualification of Nuclear Materials Integrating Experiments, Modeling, and Theories
|
| Presentation Title |
Modeling of Fission Gas Behavior in Uranium Nitride Fuel |
| Author(s) |
Jason Rizk, Christopher Matthews, Michael Cooper, Anton Schneider, Anders David Andersson |
| On-Site Speaker (Planned) |
Jason Rizk |
| Abstract Scope |
Fission gas behavior is of critical concern for uranium nitride as an advanced nuclear fuel form. Uranium nitride, like uranium carbide, exhibits “breakaway swelling,” which is an accelerated growth in the temperature-dependence of the intragranular swelling once temperature and burnup thresholds are exceeded. In order to achieve an accelerated qualification of the fuel, a mechanistic fission gas model should be able to capture the relevant physics that cause this phenomenon. In the model presented, fission gas interacts with both the intragranular dislocation network and the grain boundaries. Leveraging lower-length scale calculations and free energy cluster dynamics simulations, defect concentrations and diffusivities under irradiation are determined. A mechanistic dislocation loop evolution model is included. The dislocation density calculations and fuel performance simulations are compared to experimental data. This work advances the qualification efforts of uranium nitride fuel, and provides insight into the mechanisms causing the “breakaway swelling” phenomenon. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Modeling and Simulation, |